Initialize century of RTC CMOS.

Initialize century of RTC CMOS, in case that SetTime service does not set it.

1 files changed, 16 insertions, 0 deletions

diff --git a/Vlv2TbltDevicePkg/PlatformDxe/Rtc.c b/Vlv2TbltDevicePkg/PlatformDxe/Rtc.c
index caa042ff4f..9415b7e2ad 100644
--- a/Vlv2TbltDevicePkg/PlatformDxe/Rtc.c
+++ b/Vlv2TbltDevicePkg/PlatformDxe/Rtc.c
@@ -22,6 +22,13 @@
 #define RTC_INIT_SECOND 0

 #define RTC_INIT_MINUTE 0

 #define RTC_INIT_HOUR   0

+

+#define RTC_ADDRESS_CENTURY           50  // R/W  Range 19..20 Bit 8 is R/W

+

+#define RTC_ADDRESS_REGISTER     0x70

+#define RTC_DATA_REGISTER        0x71

+

+

  

 CHAR16  mBiosReleaseDate[20];    

   

@@ -91,6 +98,7 @@ AdjustDefaultRtcTimeCallback (
 {

   EFI_STATUS      Status;

   EFI_TIME        EfiTime;

+  UINT8           Century;

   CHAR16          BiosVersion[60];    

   CHAR16          BiosReleaseTime[20];    

   //

@@ -154,6 +162,14 @@ AdjustDefaultRtcTimeCallback (
     //

     Status = gRT->SetTime (&EfiTime);

     ASSERT_EFI_ERROR(Status);

+

+    //

+    // Set the RTC century in case that UEFI SetTime sevice does not set this register.

+    //

+    Century    = DecimalToBcd8 ((UINT8) (EfiTime.Year / 100));

+    IoWrite8 (RTC_ADDRESS_REGISTER, (UINT8) (RTC_ADDRESS_CENTURY | (UINT8) (IoRead8 (PCAT_RTC_ADDRESS_REGISTER) & 0x80)));

+    IoWrite8 (RTC_DATA_REGISTER, Century);

+

   }

 

   return;